The options dialog lets you ask for iconv support to be disabled, but
just adding --disable-iconv isn't enough.  That simply disables rsync's
--iconv flag but still allows libiconv to be linked into the binary...

Fix: Set the appropriate autoconf cache variables so that rsync's configure
script completely skips iconv detection, even if it's present on the
system.  As a bonus, no post-configure fixup is needed:
How-To-Repeat: 	

Install libiconv, uncheck "Add iconv support" in the rsync options
screen, build rsync.  The link stage will fail with:

rsync.o(.text+0xffe): In function `iconvbufs':
: undefined reference to `libiconv'
rsync.o(.text+0x1132): In function `iconvbufs':
: undefined reference to `libiconv'
rsync.o(.text+0x11b8): In function `setup_iconv':
: undefined reference to `locale_charset'
rsync.o(.text+0x11de): In function `setup_iconv':
: undefined reference to `libiconv_open'
*** Error code 1